2. How do your respiratory and circulatory systems attempt to maintain homeostasis during exercise? A. Your body produces more red blood cells to help provide energy to cells.
B. Your lungs produce more oxygen which is then delivered to the cells through the blood.
C. You experience an increase in blood flow which provides nutrients to cells to increase energy and
remove wastes.
D. You experience an increase in breathing rate to obtain more oxygen which is delivered to cells
through the bloodstream.

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this